I do find the attire she was wearing slightly bizarre if she was getting ready for bed. She was wearing both running shoes and a black shoulder bag. From someone who posted earlier there is a possibility she had called her boyfriend to come over (for an unknown reason). Was the clothing description given by him I wonder? It states she left everything behind...well she had a handbag/backpack (I'm unsure exactly what a shoulder bag refers to) so...was it empty? I highly doubt it, so she can't have left everything .
I am curious to know who discovered her missing at 7.30. Either way, it sounds to me like she never slept in that room that night but left with her gentleman caller. Whoever he was I woukd suspect he knows more.